The specifications of our auditorium chair: 1. Outer cover: plastic shell (poly propylene,injection molded): Absorb sound;anti-aging; anti-impact;anti-UV; anti-fading. 2. Outer upholstery: Fabric,PU leather,Artificial leather or Real leather: Anti-abrasion; dirty proof; water proof; fire proof; anti-static. we have Chinese fabrics and European fabrics for client's choice. 3. Chair armrest: PU,Plastic or wood (beech wood,oak wood,Walnut wood.....solid wood). 4.Chair leg is made of cold-rolled 2.5mm thick steel tube with powder coating: anti rust.Chair leg can be fixed or movable. If fixed leg, the chair would be fixed on floor by 4 pcs of strong screws.If moveable leg, chair can be moved with wheels. 5. Inner material: Molded PU(polyurethane) foam and the foam density is: Seat foam: 55kgs/m3; backrest foam:45kgs/m3. 6. Inner structure: Metal frame or strong plywood. 7. Chair seat fold-up mechanism: seat tips up by metal spring or by gravity. 8. Optional accessaries: anti-panic retractable writing table on arm; Foldable writing pad at the rear of chair back; writing table can be made of wood or plastic.cupholder; bookrack; numbering for seat and row. 9. Fire retardant for chair fabric and foam: USA standard CA117, UK standard BS5852,BS7176. 10. Chair dimensions: (1) chair arm center to arm center distance:560-590mm(standard is 585mm). (2) chair arm width:85mm (3) chair seat height:420mm (4) chair backrest height:970mm (5) chair armrest height:600mm (6) chair depth from backrest to seat(when opens):740mm (7) chair depth from backrest to the writing table(when opens):880mm (8) chair depth from backrest to chair armrest:560mm 11. Options: (1) if the normal writing table is not acceptable by client, itcan be replaced by a new best aluminum structure writing table.Thiswriting table is made of strong aluminum structure with plastic (ABS) writing table,which can 360 degree revolving and big enough(340*255mm) to place laptop. (2) plastic seat cover and backrest cover can be upholstery with fabric. (3) chair seat can be fixed there. 12. Warranty: We have 5-year warranty for our chairs. 13. Applicable sites: Government,school,university,college,hospital,hotel,theater,theatre,cinema,conference hall, concert hall,music hall,church,lecture hall, Amphitheater, amphitheatre, stadium, Arena, 14. Detailed photos of our auditorium chair AK-5003: